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    <title>Document</title>
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    <button onclick="changeLocalstorage()">改变</button>
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        // 当前标签页改变并不会触发此事件
        window.onstorage = function(e){
            console.log(e);
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        var i = 0;

        function changeLocalstorage(){
            window.localStorage.setItem('token', i++)
        }
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